Photos of the Week for April 26, 2013

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Dallas police and other law enforcement officials stand on the flight line as they help provide security before the arrival of President Barack Obama Wednesday in Dallas at Love Field. (AP Photo/Tony Gutierrez)

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A Revere, Mass. police captain holds his cap while entering a memorial service for fallen Massachusetts Institute of Technology police officer Sean Collier, in Cambridge, Mass., Wednesday. Full story (AP Photo/Steven Senne)

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Police stand guard near barricades protecting the Spanish Parliament as a protest is announced in Madrid, Spain, Thursday. (AP Photo/Andres Kudacki)

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Members of the Los Angeles Police Department Internet Crimes Children Task Force arrive with a search warrant of the home of a suspect, alleged to be California's most active trader of child pornography in Los Angeles Wednesday. (AP Photo/Damian Dovarganes)

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Thousands of students at the University of California Santa Cruz gather on campus on April 20 every year to celebrate '4-20' by lighting up marijuana at 4.20pm. One student went farther than most on Saturday when he unveiled a massive two-pound joint. Full story (Image YouTube)

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A Turkish flag is seen behind riot police during the annual rally to protest the mass killings of Armenians in Ottoman Turkey nearly a century ago in Thessaloniki, Greece on Wednesday. (AP Photo/Nikolas Giakoumidis)

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A blood-pumping raid by the FBI on a New Jersey home turned into the butt of hundreds of online jokes when an agent's dramatic climb over a gate proved far more embarrassing than necessary. Full story (Image YouTube)